Fixed broken link to contribution guidelines (#14009)

* Fixed broken link to contribution guidelines

I assume the correct link should be `https://opensource.microsoft.com/collaborate` like it was updated in other projects like [azure-sdk](https://github.com/Azure/azure-sdk-for-c/issues/1101).

* Updated broken link in contributing.md

Co-authored-by: Damien Caro <dcaro@microsoft.com>

CONTRIBUTING.md

@@ -4,7 +4,7 @@ This repository contains PowerShell cmdlets for developers and administrators to
 
 ## Basics
 
-If you would like to become an active contributor to this project (or any other open source Microsoft project), please see the list of resources found on [this page](https://opensource.microsoft.com/resources).
+If you would like to become an active contributor to this project (or any other open source Microsoft project), please see the list of resources found on [this page](https://opensource.microsoft.com/collaborate/).
 
 ## Before Starting
 

README.md

@@ -182,7 +182,7 @@ _This project has adopted the [Microsoft Open Source Code of Conduct][CodeOfCond
 [DotNetFramework]: https://dotnet.microsoft.com/download/dotnet-framework-runtime
 [PowerShellCore]: https://github.com/PowerShell/PowerShell/releases/latest
 
-[ContributionGuidelines]: https://azure.github.io/guidelines/
+[ContributionGuidelines]: https://opensource.microsoft.com/collaborate/
 [CodeOfConduct]: https://opensource.microsoft.com/codeofconduct/
 [CodeOfConductFaq]: https://opensource.microsoft.com/codeofconduct/faq/
 [OpenCodeEmail]: mailto:opencode@microsoft.com